Loir en Vallée (, literally Loir in Valley) is a commune in the department of Sarthe, northwestern France. The municipality was established on 1 January 2017 by merger of the former communes of Ruillé-sur-Loir (the seat), La Chapelle-Gaugain, Lavenay and Poncé-sur-le-Loir.Arrêté préfectoral 16 December 2016
Ruillé-sur-Loir was the first home to the Brothers of St. Joseph, now the Congregation of Holy Cross associated with the University of Notre Dame.
Population Population data refer to the area corresponding with the commune as of January 2025.
See also Communes of the Sarthe department
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